/*
 * Anything: A flexible and easy to use data structure that combines the 
 * characteristics of a list and a hashmap into one data structure.
 * 
 * Based on a paper by Peter Sommerlad and Marcel Rueedi on 
 * 'Do-it-yourself reflection' entered at EuroPLOP 1998.
 * 
 * This library was written completely from scratch and is based only 
 * in spirit on the original Java Anything implementation written by 
 * Andre Weinand/Marcel Rueedi in 1997/99 and enhanced by Stefan Tramm 
 * in 2006.
 * 
 * Copyright (c) 2008 Thomas Marti and others. All rights reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package any.functor.impl.func;

import static any.functor.Functions.asEntries;

import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Map.Entry;

import any.ImmutableAny;
import any.functor.interfaces.AsMap;
import any.functor.interfaces.Function;
import any.functor.interfaces.FunctionTypedPredicate;

public class AsMapImpl<T> 
	extends BaseAnyFunction<T, Map<String, T>, AsMapImpl<T>> 
	implements AsMap<T> {

	Function<ImmutableAny, T> asFunc;

	public Map<String, T> apply(ImmutableAny from) {
		Map<String, T> map;
		if (direction != null) {
			map = new LinkedHashMap<String, T>();
		} else {
			map = new HashMap<String, T>();
		}
		Iterable<Entry<String, T>> entries = from.give(asEntries().select(predicate).eachElement(asFunc).order(direction));
		for (Entry<String, T> entry : entries) {
			if (entry.getKey() != null) {
				map.put(entry.getKey(), entry.getValue());
			}			
		}
		return map;
	}

	@SuppressWarnings("unchecked")
	public <X> AsMap<X> eachElement(Function<ImmutableAny, X> asFunc) {
		this.asFunc = (Function<ImmutableAny, T>)asFunc;
		return (AsMap<X>)this;
	}
	
	@SuppressWarnings("unchecked")
	public <X> AsMap<X> select(FunctionTypedPredicate<X> predicate) {
		this.asFunc = (Function<ImmutableAny, T>)predicate.getAsFunction();
		super.select(predicate);
		return (AsMap<X>)this;
	}
	
	//TODO: Continue
	public AsMap<T> ofType(Class<? extends Map<String, ?>> cls) throws NullPointerException, IllegalArgumentException {
		if (!Map.class.isAssignableFrom(cls)) throw new IllegalArgumentException();
		
		try {
//			Map<?, ?> map = cls.newInstance();
		} catch (Exception e) {
		}
		return this;
	}
	
}